planeing pad

Sonar · 14 March 2010, 18:48

planning pad a good idea or not.?

was a planning pad an old idea.

any disadvantages in having one.?
saw a rib a while ago with one that was as i said a long time ago.

Some speedboats have them. what about a rib ?

Nos4r2 · 14 March 2010, 18:59

Some do, some don't. It's horses for courses really.
The boats I've helmed that have them don't feel as 'planted' at large throttle openings as a full length V, but they've tended to be rather quick.

m chappelow · 14 March 2010, 22:04

one reason why the RNLI have them on the atlantics is that it also gives less draught at shallow depths and that when beaching it keeps the boat stood upright for ease of recovery .

Bigmuz7 · 14 March 2010, 22:13

Cant say I really noticed much of a difference when I went from Pad to Vee and Back again on 3 different boats .. bit slappier in a chop at full bung perhaps

ecoXR24 · 15 March 2010, 13:49

We have a long pad on the rear of the hull of the Eco XR24. It's mainly to reduce the draft aft, but it also helps with dynamic stability. It increases the lift aft and has a similar effect to moving the cg forwards - preventing porpoising at higher speeds. It also helps the hull to get onto the plane more quickly. You can just see it in the CAD images on our website: http://www.eco-marine.co.uk

two stroke mick · 15 March 2010, 15:26

Their is a plaining pad on My valiant Dr 490. I feel that this can lead to a solid landing if the boat leaves the water. I am expermenting at the moment by placing ballast to the front of the boat to move the center of bouyancy forward and away from the plaing pad. I have not been out enough to make a final decision if this has worked. My concern is that in a following sea that I may have too much weight in the front of the boat.

I feel that the boat would handle better if the pad was not in place.

I am looking to achive a comfortable 20kn in a head sea. I can achieve 18kn but it tends to get uncomfortable at 20 kn. Am I looking for too much speed and comfort from sush a short hull ??

TSM

Fr@nky · 15 March 2010, 20:13

I have a pad on my xr20.

It seems original made, but i did found out it not quite the same as other osprey's

Sonar · 15 March 2010, 20:16

Quote:

Originally Posted by Fr@nky

I have a pad on my xr20.

It seems original made, but i did found out it not quite the same as other osprey's

Can you tell by the way the vessel moves that it is of any advantage.?

Bigmuz7 · 15 March 2010, 21:01

Quote:

Originally Posted by Fr@nky

I have a pad on my xr20.

It seems original made, but i did found out it not quite the same as other osprey's

Blimey thats tiny .. mine was about 30 inches by 18

Sonar · 15 March 2010, 21:14

Quote:

Originally Posted by Bigmuz7

Blimey thats tiny .. mine was about 30 inches by 18

mine is 28" wide and 30" long.

Bigmuz7 · 15 March 2010, 21:53

Quote:

Originally Posted by Sonar

mine is 28" wide and 30" long.

Just proves size isnt everything

.. fact is .. I didnt find it that much of a benefit to my hull I suppose

Sonar · 15 March 2010, 22:00

Quote:

Originally Posted by Bigmuz7

Just proves size isnt everything

.. fact is .. I didnt find it that much of a benefit to my hull I suppose

Well that,s good news and i guess no disadvantage either then.

ecoXR24 · 16 March 2010, 10:20

Have any of you guys with XR20s ever been able to make the boat porpoise? On most ribs its most likely to happen with the cg towards the back. The pad on the XR24 is 2.8 metres long and 0.5 metres wide, which helps with stability. I'm surprised its so much smaller on the XR20. We're at the early stages of designing our Eco XR21 and deciding what size to make its planing pad.

9D280 · 16 March 2010, 13:18

Quote:

Originally Posted by Bigmuz7

Just proves size isnt everything

.. fact is .. I didnt find it that much of a benefit to my hull I suppose

Taking that to it's logical conclusion the ultimate planing pad is fitted to boats made by a couple of companies...... Dell Quay & Orkney are the two that spring to mind!

Sonar · 16 March 2010, 13:19

Quote:

Originally Posted by 9D280

Taking that to it's logical conclusion the ultimate planing pad is fitted to boats made by a couple of companies...... Dell Quay & Orkney are the two that spring to mind!

and a ring gto speedboat

Paul E · 16 March 2010, 13:50

Quote:

Originally Posted by ecoXR24

Have any of you guys with XR20s ever been able to make the boat porpoise? On most ribs its most likely to happen with the cg towards the back. The pad on the XR24 is 2.8 metres long and 0.5 metres wide, which helps with stability. I'm surprised its so much smaller on the XR20. We're at the early stages of designing our Eco XR21 and deciding what size to make its planing pad.

I haven't measured my pad but that looks to be approximately what it is. Fr@nky's is different as his XR20 used to have an inboard and water jet fitted. My boat is a few miles away at the moment on it's trailer, but next time I'm up there (some point this week) I will measure it for you. It's triangular in shape and starts pretty much where the V of the bow would normally start forming the keel, if that makes sense